Suzuki DF 40 Service Manual page 260

CHECKING DRIVESHAFT THRUST PLAY
After obtaining optimum tooth contact, driveshaft thrust play
should be measured.
1. Affix gear adjusting gauge to driveshaft.
09951-09510 : Gear adjusting gauge
2. Slowly push driveshaft downward.
Read the maximum play. Designate this amount of play as
(A).
NOTE:
Driveshaft thrust play (A) must be known to adjust reverse gear
shim.
RECHECKING DRIVESHAFT THRUST PLAY
( Reverse gear back-up shim adjustment )
1. After adjusting forward gear tooth contact pattern, correctly
assemble propeller shaft, housing assembly, reverse gear
and related components (see page 9-17 to 9-18).
2. Screw sliding hammer assembly onto propeller shaft and
strike a few gentle outward taps.
09930-30161 : Propeller shaft remover –
09930-30102 : Sliding hammer –
3. Affix gear adjusting gauge to driveshaft.
09951-09510 : Gear adjusting gauge
4. Push shaft downward and read maximum play. Designate
this measurement as play (B).
5. Compare play (B) to play (A)( page 9-26).
6. Reverse gear back-up shim adjustment is correct if (B) is
equal to (A).
• If (B) is less than (A), reduce reverse gear back-up shim
thickness.
LOWER UNIT 9-26